You’ve posted your question to Republic’s online community, which is largely made up of fellow members (Republic likes to call customers members). Therefore, we’re not going to be able to update you on any potential cellular service issues in your area.
The above said, we may still be able to help. When you look at the cellular signal indicator on your G4, do you see any bars and/or letters? If you see letters, may we know what those are? Additionally, please let us know if your SIM is GSM or CDMA. Here’s how to tell: How to Tell If a Phone Is Active on GSM or CDMA – Republic Help.
Meanwhile, and I appreciate this will seem incredibly obvious, have you tried restarting your phone?